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Net Pension Assets - Summary of Components of Net Benefit Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Current service cost | $ (1,767) | $ (1,724) | $ (1,638)
Interest cost on net benefit obligation | 210 | 173 | 110
Net benefit expense | (1,557) | (1,551) | (1,528)
Defined benefit obligation [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Current service cost | (1,767) | (1,724) | (1,638)
Interest cost on net benefit obligation | (568) | (516) | (422)
Net benefit expense | (2,335) | (2,240) | (2,060)
Fair value of assets [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Interest cost on net benefit obligation | 778 | 689 | 532
Net benefit expense | $ 778 | $ 689 | $ 532

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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_5&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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